Hey, The macppc platform page links to an explanation of the differences between the OldWorld and NewWorld ROMs:
http://developer.apple.com/technotes/tn/tn1167.html but that now redirects to the Apple developer API index. The latest Wayback archive of the intended page is here: https://web-beta.archive.org/web/20041011114718/http://developer.apple.com/technotes/tn/tn1167.html All archives after that date snagged the aforementioned redirect instead. -- Scott Cheloha